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The patent EP3996688 was granted to Merck Patent on Sep 6, 2023. The application was filed on Jul 8, 2020 under application number EP20736349A. The patent is currently recorded with a legal status of "Granted And Under Opposition".

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative | Opposition Status |
|---|---|---|---|
| STADA ARZNEIMITTEL | Jun 6, 2024 | KERNEBECK | ADMISSIBLE |
| ALFRED E TIEFENBACHER | Jun 5, 2024 | HAMM & WITTKOPP | ADMISSIBLE |
Patent citations refer to prior patents cited during different phases such as opposition or international search.
| Citation Phase | Publication Number |
|---|---|
| DESCRIPTION | WO2009006959 |
| DESCRIPTION | WO2009007074 |
| DESCRIPTION | WO2012028233 |
| INTERNATIONAL-SEARCH-REPORT | WO2010078897 |
| INTERNATIONAL-SEARCH-REPORT | WO2014067610 |
| INTERNATIONAL-SEARCH-REPORT | WO2015104042 |
| OPPOSITION | EP2164843 |
| OPPOSITION | US2014128396 |
| OPPOSITION | US2015011534 |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
Date
Description
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Dec 11, 2025
(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
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(Electronic) Receipt
Appeal
Oct 10, 2025
Notice of appeal
Appeal
Sep 18, 2025
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(Electronic) Receipt
Appeal
Sep 11, 2025
Notice of appeal
Appeal
Aug 14, 2025
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OPPO
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Decision to grant a European patent
Search/Exam
Jul 27, 2023
(Electronic) Receipt
Search/Exam
Jul 27, 2023
Filing of the translations of the claims
Search/Exam
Jul 27, 2023
French translation of claims
Search/Exam
Jul 27, 2023
German translation of the claims
Search/Exam
Jul 27, 2023
Letter accompanying subsequently filed items
Search/Exam
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Intention to grant (signatures)
Search/Exam
Mar 29, 2023
Text intended for grant (clean copy)
Search/Exam
Mar 29, 2023
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Examination started
Search/Exam
Apr 25, 2022
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Notification of the recording of a change
Search/Exam
Dec 9, 2021
(Electronic) Receipt
Search/Exam
Dec 9, 2021
Request for entry into the European phase
Search/Exam
Nov 19, 2021
Information on entry into European phase
Search/Exam
Feb 1, 2021
Jan 14, 2021
Copy of the international search report
Search/Exam
Jan 14, 2021
Published international application - A1
Search/Exam
Oct 9, 2020
ISR: cited documents
PCTISA
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(Electronic) Receipt
PCTRO
Jul 8, 2020
Abstract
PCTRO
Jul 8, 2020
Claims
PCTRO
Jul 8, 2020
Description
PCTRO
Jul 8, 2020
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Drawings
PCTRO
Jul 8, 2020